While you travel to any foreign country travel visa is allotted. The duration of travel visa may vary from countries to countries. To get travel visa for any particular country, you need to file an application form. For example if you are a resident of United States or a Green Card Holder of this country, you need to require a travel visa while travelling to United Kingdom. It should be mentioned in the visa about the purpose of your travelling. The United Kingdom has made some stringent rules for travel visa. They are particular about this matter. The travellers need to be well-furnished about it.